22692221 has 2 divisors, whose sum is σ = 22692222. Its totient is φ = 22692220.

The previous prime is 22692209. The next prime is 22692223. The reversal of 22692221 is 12229622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13322500 + 9369721 = 3650^2 + 3061^2 .

It is a cyclic number.

It is not a de Polignac number, because 22692221 - 2¹⁰ = 22691197 is a prime.

Together with 22692223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22692223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11346110 + 11346111.

It is an arithmetic number, because the mean of its divisors is an integer number (11346111).

Almost surely, 2^22692221 is an apocalyptic number.

It is an amenable number.

22692221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22692221 is an equidigital number, since it uses as much as digits as its factorization.

22692221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 22692221 is about 4763.6352715127. The cubic root of 22692221 is about 283.1124717868.

The spelling of 22692221 in words is "twenty-two million, six hundred ninety-two thousand, two hundred twenty-one".